sound/soc/amlogic/common/notify.c

/*
 * sound/soc/amlogic/common/notify.c
 *
 * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */
#undef pr_fmt
#define pr_fmt(fmt) "snd_notify: " fmt

#include <linux/module.h>

static BLOCKING_NOTIFIER_HEAD(aout_notifier_list);
/*
 *	aout_register_client - register a client notifier
 *	@nb: notifier block to callback on events
 */
int aout_register_client(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&aout_notifier_list, nb);
}
EXPORT_SYMBOL(aout_register_client);

/*
 *	aout_unregister_client - unregister a client notifier
 *	@nb: notifier block to callback on events
 */
int aout_unregister_client(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&aout_notifier_list, nb);
}
EXPORT_SYMBOL(aout_unregister_client);

/*
 * aout_notifier_call_chain - notify clients of fb_events
 *
 */
int aout_notifier_call_chain(unsigned long val, void *v)
{
	return blocking_notifier_call_chain(&aout_notifier_list, val, v);
}
EXPORT_SYMBOL_GPL(aout_notifier_call_chain);